X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d50c81d3adb484655e394e4257cf76bcaf4038f2..eea4d01c65f9b29baa1193db762b4c6b8144af24:/src/msw/choice.cpp diff --git a/src/msw/choice.cpp b/src/msw/choice.cpp index 84d90c83b0..03d3b3fb50 100644 --- a/src/msw/choice.cpp +++ b/src/msw/choice.cpp @@ -1,12 +1,12 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: choice.cpp +// Name: src/msw/choice.cpp // Purpose: wxChoice // Author: Julian Smart // Modified by: Vadim Zeitlin to derive from wxChoiceBase // Created: 04/01/98 // RCS-ID: $Id$ -// Copyright: (c) Julian Smart and Markus Holzem -// Licence: wxWindows license +// Copyright: (c) Julian Smart +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// // ============================================================================ @@ -17,10 +17,6 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ - #pragma implementation "choice.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -28,18 +24,20 @@ #pragma hdrstop #endif +#if wxUSE_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__)) + +#include "wx/choice.h" + #ifndef WX_PRECOMP - #include "wx/choice.h" #include "wx/utils.h" + #include "wx/app.h" #include "wx/log.h" + #include "wx/brush.h" + #include "wx/settings.h" #endif #include "wx/msw/private.h" -#if !USE_SHARED_LIBRARY - IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl) -#endif - // ============================================================================ // implementation // ============================================================================ @@ -57,53 +55,215 @@ bool wxChoice::Create(wxWindow *parent, const wxValidator& validator, const wxString& name) { - if ( !CreateControl(parent, id, pos, size, style, validator, name) ) - return FALSE; - - long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_TABSTOP | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL; - if ( style & wxCB_SORT ) - msStyle |= CBS_SORT; - - // the experience shows that wxChoice vs. wxComboBox distinction confuses + // Experience shows that wxChoice vs. wxComboBox distinction confuses // quite a few people - try to help them wxASSERT_MSG( !(style & wxCB_DROPDOWN) && !(style & wxCB_READONLY) && !(style & wxCB_SIMPLE), - _T("this style flag is ignored by wxChoice, you " - "probably want to use a wxComboBox") ); + wxT("this style flag is ignored by wxChoice, you ") + wxT("probably want to use a wxComboBox") ); - if ( !MSWCreateControl(_T("COMBOBOX"), msStyle) ) - return FALSE; + return CreateAndInit(parent, id, pos, size, n, choices, style, + validator, name); +} +bool wxChoice::CreateAndInit(wxWindow *parent, + wxWindowID id, + const wxPoint& pos, + const wxSize& size, + int n, const wxString choices[], + long style, + const wxValidator& validator, + const wxString& name) +{ + // initialize wxControl + if ( !CreateControl(parent, id, pos, size, style, validator, name) ) + return false; + + // now create the real HWND + if ( !MSWCreateControl(wxT("COMBOBOX"), wxEmptyString, pos, size) ) + return false; + + + // initialize the controls contents for ( int i = 0; i < n; i++ ) { Append(choices[i]); } - SetSize(pos.x, pos.y, size.x, size.y); + // and now we may finally size the control properly (if needed) + SetInitialSize(size); + + return true; +} + +void wxChoice::SetLabel(const wxString& label) +{ + if ( FindString(label) == wxNOT_FOUND ) + { + // unless we explicitly do this here, CB_GETCURSEL will continue to + // return the index of the previously selected item which will result + // in wrongly replacing the value being set now with the previously + // value if the user simply opens and closes (without selecting + // anything) the combobox popup + SetSelection(-1); + } + + wxChoiceBase::SetLabel(label); +} + +bool wxChoice::Create(wxWindow *parent, + wxWindowID id, + const wxPoint& pos, + const wxSize& size, + const wxArrayString& choices, + long style, + const wxValidator& validator, + const wxString& name) +{ + wxCArrayString chs(choices); + return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(), + style, validator, name); +} + +bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg) +{ + MSG *msg = (MSG *) pMsg; + + // if the dropdown list is visible, don't preprocess certain keys + if ( msg->message == WM_KEYDOWN + && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) ) + { + if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0)) + { + return false; + } + } + + return wxControl::MSWShouldPreProcessMessage(pMsg); +} + +WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const +{ + // we never have an external border + WXDWORD msStyle = wxControl::MSWGetStyle + ( + (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle + ); + + // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in + // any problems + msStyle |= WS_CLIPSIBLINGS; + + // wxChoice-specific styles + msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL; + if ( style & wxCB_SORT ) + msStyle |= CBS_SORT; + + return msStyle; +} + +#ifndef EP_EDITTEXT + #define EP_EDITTEXT 1 + #define ETS_NORMAL 1 +#endif + +wxVisualAttributes +wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant)) +{ + // it is important to return valid values for all attributes from here, + // GetXXX() below rely on this + wxVisualAttributes attrs; + + // FIXME: Use better dummy window? + wxWindow* wnd = wxTheApp->GetTopWindow(); + if (!wnd) + return attrs; - return TRUE; + attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT); + + // there doesn't seem to be any way to get the text colour using themes + // API: TMT_TEXTCOLOR doesn't work neither for EDIT nor COMBOBOX + attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT); + + // NB: use EDIT, not COMBOBOX (the latter works in XP but not Vista) + attrs.colBg = wnd->MSWGetThemeColour(L"EDIT", + EP_EDITTEXT, + ETS_NORMAL, + ThemeColourBackground, + wxSYS_COLOUR_WINDOW); + + return attrs; +} + +wxChoice::~wxChoice() +{ + Clear(); } // ---------------------------------------------------------------------------- // adding/deleting items to/from the list // ---------------------------------------------------------------------------- -void wxChoice::DoAppend(const wxString& item) +int wxChoice::DoInsertItems(const wxArrayStringsAdapter& items, + unsigned int pos, + void **clientData, wxClientDataType type) { - SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LONG)item.c_str()); + MSWAllocStorage(items, CB_INITSTORAGE); + + const bool append = pos == GetCount(); + + // use CB_ADDSTRING when appending at the end to make sure the control is + // resorted if it has wxCB_SORT style + const unsigned msg = append ? CB_ADDSTRING : CB_INSERTSTRING; + + if ( append ) + pos = 0; + + int n = wxNOT_FOUND; + const unsigned numItems = items.GetCount(); + for ( unsigned i = 0; i < numItems; ++i ) + { + n = MSWInsertOrAppendItem(pos, items[i], msg); + if ( n == wxNOT_FOUND ) + return n; + + if ( !append ) + pos++; + + AssignNewItemClientData(n, clientData, i, type); + } + + // we need to refresh our size in order to have enough space for the + // newly added items + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); + + return n; } -void wxChoice::Delete(int n) +void wxChoice::DoDeleteOneItem(unsigned int n) { - wxCHECK_RET( n < GetCount(), _T("invalid item index in wxChoice::Delete") ); + wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") ); SendMessage(GetHwnd(), CB_DELETESTRING, n, 0); + + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); } -void wxChoice::Clear() +void wxChoice::DoClear() { SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0); + + if ( !IsFrozen() ) + MSWUpdateDropDownHeight(); + + InvalidateBestSize(); } // ---------------------------------------------------------------------------- @@ -111,6 +271,17 @@ void wxChoice::Clear() // ---------------------------------------------------------------------------- int wxChoice::GetSelection() const +{ + // if m_lastAcceptedSelection is set, it means that the dropdown is + // currently shown and that we want to use the last "permanent" selection + // instead of whatever is under the mouse pointer currently + // + // otherwise, get the selection from the control + return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection() + : m_lastAcceptedSelection; +} + +int wxChoice::GetCurrentSelection() const { return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0); } @@ -124,43 +295,98 @@ void wxChoice::SetSelection(int n) // string list functions // ---------------------------------------------------------------------------- -int wxChoice::GetCount() const +unsigned int wxChoice::GetCount() const { - return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0); + return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0); } -int wxChoice::FindString(const wxString& s) const +int wxChoice::FindString(const wxString& s, bool bCase) const { #if defined(__WATCOMC__) && defined(__WIN386__) // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message. // wxChoice::Do it the long way instead. - int count = GetCount(); - for ( int i = 0; i < count; i++ ) + unsigned int count = GetCount(); + for ( unsigned int i = 0; i < count; i++ ) { // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too - if ( GetString(i).IsSameAs(s, FALSE) ) + if (GetString(i).IsSameAs(s, bCase)) return i; } return wxNOT_FOUND; #else // !Watcom - int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT, - (WPARAM)-1, (LPARAM)s.c_str()); - - return pos == LB_ERR ? wxNOT_FOUND : pos; + //TODO: Evidently some MSW versions (all?) don't like empty strings + //passed to SendMessage, so we have to do it ourselves in that case + if ( s.empty() ) + { + unsigned int count = GetCount(); + for ( unsigned int i = 0; i < count; i++ ) + { + if (GetString(i).empty()) + return i; + } + + return wxNOT_FOUND; + } + else if (bCase) + { + // back to base class search for not native search type + return wxItemContainerImmutable::FindString( s, bCase ); + } + else + { + int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT, + (WPARAM)-1, (LPARAM)s.wx_str()); + + return pos == LB_ERR ? wxNOT_FOUND : pos; + } #endif // Watcom/!Watcom } -wxString wxChoice::GetString(int n) const +void wxChoice::SetString(unsigned int n, const wxString& s) +{ + wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") ); + + // we have to delete and add back the string as there is no way to change a + // string in place + + // we need to preserve the client data manually + void *oldData = NULL; + wxClientData *oldObjData = NULL; + if ( HasClientUntypedData() ) + oldData = GetClientData(n); + else if ( HasClientObjectData() ) + oldObjData = GetClientObject(n); + + ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0); + ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.wx_str() ); + + // restore the client data + if ( oldData ) + SetClientData(n, oldData); + else if ( oldObjData ) + SetClientObject(n, oldObjData); + + InvalidateBestSize(); +} + +wxString wxChoice::GetString(unsigned int n) const { - size_t len = (size_t)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0); - wxString str = ""; - if (len) { - if ( ::SendMessage(GetHwnd(), CB_GETLBTEXT, n, - (LPARAM)str.GetWriteBuf(len)) == CB_ERR ) { - wxLogLastError("SendMessage(CB_GETLBTEXT)"); + int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0); + + wxString str; + if ( len != CB_ERR && len > 0 ) + { + if ( ::SendMessage + ( + GetHwnd(), + CB_GETLBTEXT, + n, + (LPARAM)(wxChar *)wxStringBuffer(str, len) + ) == CB_ERR ) + { + wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)")); } - str.UngetWriteBuf(); } return str; @@ -170,64 +396,196 @@ wxString wxChoice::GetString(int n) const // client data // ---------------------------------------------------------------------------- -void wxChoice::DoSetClientData( int n, void* clientData ) +void wxChoice::DoSetItemClientData(unsigned int n, void* clientData) { - if ( SendMessage(GetHwnd(), CB_SETITEMDATA, n, (LPARAM)clientData) == CB_ERR ) + if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA, + n, (LPARAM)clientData) == CB_ERR ) { - wxLogLastError(_T("CB_SETITEMDATA")); + wxLogLastError(wxT("CB_SETITEMDATA")); } } -void* wxChoice::DoGetClientData( int n ) const +void* wxChoice::DoGetItemClientData(unsigned int n) const { LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0); if ( rc == CB_ERR ) { - wxLogLastError(_T("CB_GETITEMDATA")); + wxLogLastError(wxT("CB_GETITEMDATA")); // unfortunately, there is no way to return an error code to the user - rc = (LPARAM) NULL; + rc = (LPARAM) NULL; } return (void *)rc; } -void wxChoice::DoSetClientObject( int n, wxClientData* clientData ) +// ---------------------------------------------------------------------------- +// wxMSW-specific geometry management +// ---------------------------------------------------------------------------- + +namespace +{ + +// there is a difference between the height passed to CB_SETITEMHEIGHT and the +// real height of the combobox; it is probably not constant for all Windows +// versions/settings but right now I don't know how to find what it is so it is +// temporarily hardcoded to its value under XP systems with normal fonts sizes +const int COMBO_HEIGHT_ADJ = 6; + +} // anonymous namespace + +void wxChoice::MSWUpdateVisibleHeight() +{ + if ( m_heightOwn != wxDefaultCoord ) + { + ::SendMessage(GetHwnd(), CB_SETITEMHEIGHT, + (WPARAM)-1, m_heightOwn - COMBO_HEIGHT_ADJ); + } +} + +#if wxUSE_DEFERRED_SIZING +void wxChoice::MSWEndDeferWindowPos() { - DoSetClientData(n, clientData); + // we can only set the height of the choice itself now as it is reset to + // default every time the control is resized + MSWUpdateVisibleHeight(); + + wxChoiceBase::MSWEndDeferWindowPos(); } +#endif // wxUSE_DEFERRED_SIZING -wxClientData* wxChoice::DoGetClientObject( int n ) const +void wxChoice::MSWUpdateDropDownHeight() { - return (wxClientData *)DoGetClientData(n); + // be careful to not change the width here + DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y, + wxSIZE_USE_EXISTING); } -// ---------------------------------------------------------------------------- -// wxMSW specific helpers -// ---------------------------------------------------------------------------- +void wxChoice::DoMoveWindow(int x, int y, int width, int height) +{ + // here is why this is necessary: if the width is negative, the combobox + // window proc makes the window of the size width*height instead of + // interpreting height in the usual manner (meaning the height of the drop + // down list - usually the height specified in the call to MoveWindow() + // will not change the height of combo box per se) + // + // this behaviour is not documented anywhere, but this is just how it is + // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without + // the check, constraints/sizers using combos may break the height + // constraint will have not at all the same value as expected + if ( width < 0 ) + return; + + wxControl::DoMoveWindow(x, y, width, height); +} + +void wxChoice::DoGetSize(int *w, int *h) const +{ + wxControl::DoGetSize(w, h); + + // this is weird: sometimes, the height returned by Windows is clearly the + // total height of the control including the drop down list -- but only + // sometimes, and sometimes it isn't so work around this here by using our + // own stored value if we have it + if ( h && m_heightOwn != wxDefaultCoord ) + *h = m_heightOwn; +} void wxChoice::DoSetSize(int x, int y, int width, int height, int sizeFlags) { - // Ignore height parameter because height doesn't mean 'initially - // displayed' height, it refers to the drop-down menu as well. The - // wxWindows interpretation is different; also, getting the size returns - // the _displayed_ size (NOT the drop down menu size) so - // setting-getting-setting size would not work. - wxControl::DoSetSize(x, y, width, -1, sizeFlags); + const int heightBest = GetBestSize().y; + + // we need the real height below so get the current one if it's not given + if ( height == wxDefaultCoord ) + { + // height not specified, use the same as before + DoGetSize(NULL, &height); + } + else if ( height == heightBest ) + { + // we don't need to manually manage our height, let the system use the + // default one + m_heightOwn = wxDefaultCoord; + } + else // non-default height specified + { + // set our new own height but be careful not to make it too big: the + // native control apparently stores it as a single byte and so setting + // own height to 256 pixels results in default height being used (255 + // is still ok) + m_heightOwn = height; + + if ( m_heightOwn > UCHAR_MAX ) + m_heightOwn = UCHAR_MAX; + // nor too small: see MSWUpdateVisibleHeight() + else if ( m_heightOwn < COMBO_HEIGHT_ADJ ) + m_heightOwn = COMBO_HEIGHT_ADJ; + } + + + // the height which we must pass to Windows should be the total height of + // the control including the drop down list while the height given to us + // is, of course, just the height of the permanently visible part of it so + // add the drop down height to it + + // don't make the drop down list too tall, arbitrarily limit it to 30 + // items max and also don't make it too small if it's currently empty + size_t nItems = GetCount(); + if (!HasFlag(wxCB_SIMPLE)) + { + if ( !nItems ) + nItems = 9; + else if ( nItems > 30 ) + nItems = 30; + } + + const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0); + int heightWithItems = 0; + if (!HasFlag(wxCB_SIMPLE)) + heightWithItems = height + hItem*nItems; + else + heightWithItems = SetHeightSimpleComboBox(nItems); + + + // do resize the native control + wxControl::DoSetSize(x, y, width, heightWithItems, sizeFlags); + + + // make the control itself of the requested height: notice that this + // must be done after changing its size or it has no effect (apparently + // the height is reset to default during the control layout) and that it's + // useless to do it when using the deferred sizing -- in this case it + // will be done from MSWEndDeferWindowPos() +#if wxUSE_DEFERRED_SIZING + if ( m_pendingSize == wxDefaultSize ) + { + // not using deferred sizing, update it immediately + MSWUpdateVisibleHeight(); + } + else // in the middle of deferred sizing + { + // we need to report the size of the visible part of the control back + // in GetSize() and not height stored by DoSetSize() in m_pendingSize + m_pendingSize = wxSize(width, height); + } +#else // !wxUSE_DEFERRED_SIZING + // always update the visible height immediately + MSWUpdateVisibleHeight(); +#endif // wxUSE_DEFERRED_SIZING } -wxSize wxChoice::DoGetBestSize() +wxSize wxChoice::DoGetBestSize() const { // find the widest string - int wLine; int wChoice = 0; - int nItems = GetCount(); - for ( int i = 0; i < nItems; i++ ) + int hChoice; + const unsigned int nItems = GetCount(); + for ( unsigned int i = 0; i < nItems; i++ ) { - wxString str(GetString(i)); - GetTextExtent(str, &wLine, NULL); + int wLine; + GetTextExtent(GetString(i), &wLine, NULL); if ( wLine > wChoice ) wChoice = wLine; } @@ -237,33 +595,66 @@ wxSize wxChoice::DoGetBestSize() if ( wChoice == 0 ) wChoice = 100; - // the combobox should be larger than the widest string - int cx, cy; - wxGetCharSize(GetHWND(), &cx, &cy, &GetFont()); - - wChoice += 5*cx; + // the combobox should be slightly larger than the widest string + wChoice += 5*GetCharWidth(); + if( HasFlag( wxCB_SIMPLE ) ) + { + hChoice = SetHeightSimpleComboBox( nItems ); + } + else + hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(GetCharHeight()); - // Choice drop-down list depends on number of items (limited to 10) - size_t nStrings = nItems == 0 ? 10 : wxMin(10, nItems) + 1; - int hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*nStrings; + wxSize best(wChoice, hChoice); + CacheBestSize(best); + return best; +} - return wxSize(wChoice, hChoice); +int wxChoice::SetHeightSimpleComboBox(int nItems) const +{ + int cx, cy; + wxGetCharSize( GetHWND(), &cx, &cy, GetFont() ); + int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0); + return EDIT_HEIGHT_FROM_CHAR_HEIGHT( cy ) * wxMin( wxMax( nItems, 3 ), 6 ) + hItem - 1; } -long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) +// ---------------------------------------------------------------------------- +// MSW message handlers +// ---------------------------------------------------------------------------- + +WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) { - if ( nMsg == WM_LBUTTONUP ) + switch ( nMsg ) { - int x = (int)LOWORD(lParam); - int y = (int)HIWORD(lParam); - - // Ok, this is truly weird, but if a panel with a wxChoice loses the - // focus, then you get a *fake* WM_LBUTTONUP message with x = 65535 and - // y = 65535. Filter out this nonsense. - // - // VZ: I'd like to know how to reproduce this please... - if ( x == 65535 && y == 65535 ) - return 0; + case WM_LBUTTONUP: + { + int x = (int)LOWORD(lParam); + int y = (int)HIWORD(lParam); + + // Ok, this is truly weird, but if a panel with a wxChoice + // loses the focus, then you get a *fake* WM_LBUTTONUP message + // with x = 65535 and y = 65535. Filter out this nonsense. + // + // VZ: I'd like to know how to reproduce this please... + if ( x == 65535 && y == 65535 ) + return 0; + } + break; + + // we have to handle both: one for the normal case and the other + // for readonly + case WM_CTLCOLOREDIT: + case WM_CTLCOLORLISTBOX: + case WM_CTLCOLORSTATIC: + { + WXHDC hdc; + WXHWND hwnd; + UnpackCtlColor(wParam, lParam, &hdc, &hwnd); + + WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd); + if ( hbr ) + return (WXLRESULT)hbr; + //else: fall through to default window proc + } } return wxWindow::MSWWindowProc(nMsg, wParam, lParam); @@ -271,18 +662,97 @@ long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam) bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id)) { - if ( param != CBN_SELCHANGE) + /* + The native control provides a great variety in the events it sends in + the different selection scenarios (undoubtedly for greater amusement of + the programmers using it). For the reference, here are the cases when + the final selection is accepted (things are quite interesting when it + is cancelled too): + + A. Selecting with just the arrows without opening the dropdown: + 1. CBN_SELENDOK + 2. CBN_SELCHANGE + + B. Opening dropdown with F4 and selecting with arrows: + 1. CBN_DROPDOWN + 2. many CBN_SELCHANGE while changing selection in the list + 3. CBN_SELENDOK + 4. CBN_CLOSEUP + + C. Selecting with the mouse: + 1. CBN_DROPDOWN + -- no intermediate CBN_SELCHANGEs -- + 2. CBN_SELENDOK + 3. CBN_CLOSEUP + 4. CBN_SELCHANGE + + Admire the different order of messages in all of those cases, it must + surely have taken a lot of effort to Microsoft developers to achieve + such originality. + */ + switch ( param ) { - // "selection changed" is the only event we're after - return FALSE; + case CBN_DROPDOWN: + // we use this value both because we don't want to track selection + // using CB_GETCURSEL while the dropdown is opened and because we + // need to reset the selection back to it if it's eventually + // cancelled by user + m_lastAcceptedSelection = GetCurrentSelection(); + break; + + case CBN_CLOSEUP: + // if the selection was accepted by the user, it should have been + // reset to wxID_NONE by CBN_SELENDOK, otherwise the selection was + // cancelled and we must restore the old one + if ( m_lastAcceptedSelection != wxID_NONE ) + { + SetSelection(m_lastAcceptedSelection); + m_lastAcceptedSelection = wxID_NONE; + } + break; + + case CBN_SELENDOK: + // reset it to prevent CBN_CLOSEUP from undoing the selection (it's + // ok to reset it now as GetCurrentSelection() will now return the + // same thing anyhow) + m_lastAcceptedSelection = wxID_NONE; + + { + const int n = GetSelection(); + + wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId); + event.SetInt(n); + event.SetEventObject(this); + + if ( n > -1 ) + { + event.SetString(GetStringSelection()); + InitCommandEventWithItems(event, n); + } + + ProcessCommand(event); + } + break; + + // don't handle CBN_SELENDCANCEL: just leave m_lastAcceptedSelection + // valid and the selection will be undone in CBN_CLOSEUP above + + // don't handle CBN_SELCHANGE neither, we don't want to generate events + // while the dropdown is opened -- but do add it if we ever need this + + default: + return false; } - wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId); - event.SetInt(GetSelection()); - event.SetEventObject(this); - event.SetString(GetStringSelection()); - ProcessCommand(event); + return true; +} + +WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd) +{ + if ( !IsEnabled() ) + return MSWControlColorDisabled(hDC); - return TRUE; + return wxChoiceBase::MSWControlColor(hDC, hWnd); } +#endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)